While the rationing is forecast, It reminds me of the last time we had this. At that time, I designed a 2KVA invertor system from scratch with power MOSFETS which ran on 2 lead acid batteries with an external charger ( 100ah ). This thing ran for 7 hours continuos powering a 30amp load. This time around, no need for that as many things are cheaply available. noise free minimum requirements, power delivery at least 8 hrs at 40% load : - Power 2 energy saving bulbs. These are the AC philips 8watt ( 40 watt output ). DC load on good quality cable : 0.5amps max each - Laptop and charger. DC load on good quality cable : 2 amps max - Printer ( inkjet, not laser ) . DC load on good quality cable : 4amps max - Wifi Router. DC load on good quality cable : 0.1 amp max cheap options available : - For lighting, I can use DC flourecent tube 8Watt. These run on 12 VDC. run a separate DC line from the batteries @ 0.2amp each. - Use an invertor or modify a 650VA UPS for AC supply. split the DC and AC circuits while good ventilation is important - Purchase 2 batteries ( 100ah each stacked in parallel, total 200ah ) sealed maintainence free type ( must be in ventilated area ) - purchase a single solar panel with line charger or incase of UPS, increase charging transformer size. Or AC charger upto 10amps. sketch : !!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!! ! charging !------------! Invertor/ !-----------------AC Output ( fused protection) !system+batt ! ! UPS ! !!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!! ! !-------------------------------------------------------------DC Output ( fused protection ) ( correct as necessary )